A second-order dynamic subgrid-scale stress model

A second-order dynamic model based on the general relation between the subg rid-scale stress and the velocity gradient tensors was proposed. A priori t est of the second-order model was made using moderate resolution direct num erical simulation date at high Reynolds number ( Taylor microscale Reynolds number R-lambda = 102 similar to 216) for homogeneous, isotropic forced fl ow, decaying flow, and homogeneous rotating flow. Numerical testing shows t hat the second-order dynamic model significantly improves the correlation c oefficient when compared to the first-order dynamic models.